Another title that I'm always looking for at library sales is:
MR. WICKER'S WINDOW by Carley Dawson. Illustrated by Lynd Ward. Boston: Houghton Mifflin, 1952.
This was a very well written time-slip fantasy as were the sequels THE SIGN of THE SEVEN SEAS and DRAGON RUN. All three were well written, very collectible, and well worth picking up even as a library discard.